Lake Macleod is a
marine salt lake
A salt lake or saline lake is a landlocked body of water that has a concentration of salts (typically sodium chloride) and other dissolved minerals significantly higher than most lakes (often defined as at least three grams of salt per liter). I ...
in the
Gascoyne
The Gascoyne region is one of the nine regions of Western Australia. It is located in the northwest of Western Australia, and consists of the local government areas of Carnarvon, Exmouth, Shark Bay and Upper Gascoyne. The Gascoyne has about of ...
region of
Western Australia
Western Australia (WA) is the westernmost state of Australia. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to the south, the Northern Territory to the north-east, and South Australia to the south-east. Western Aust ...
, north of the port and regional centre of .
History
Dirk Hartog
Dirk Hartog (; baptised 30 October 1580 – buried 11 October 1621) was a 17th-century Dutch sailor and explorer. Dirk Hartog's expedition was the second European group to land in Australia and the first to leave behind an artifact to record hi ...
, a
Dutchman, made the first authenticated landing by a European along this coastline in 1616. Early explorers recorded phenomenal tidal ranges along this coast.
Description
Most of Lake Macleod is normally dry, covering an area of , of which is covered by perennial bodies of
brine
Brine (or briny water) is a high-concentration solution of salt (typically sodium chloride or calcium chloride) in water. In diverse contexts, ''brine'' may refer to the salt solutions ranging from about 3.5% (a typical concentration of seawat ...
.
Climatically, this part of Western Australia is greatly influenced by the north-flowing Western Australian Current that brings cool water northward from
Antarctica
Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean (also known as the Antarctic Ocean), it contains the geographic South Pole. ...
, which is not conducive to producing inland
precipitation
In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls from clouds due to gravitational pull. The main forms of precipitation include drizzle, rain, rain and snow mixed ("sleet" in Commonwe ...
. This cool offshore current, coupled with a very flat coastal plain, contributes to the near-desert-like conditions along the coastal region as evidenced by the brown landscape around the lake and the highly reflective salt beds within the lake. The low point in the lake appears to be near the northern end where the light blues indicate some standing water. Close inspection of the image discloses very faint lines at the southernmost end of Lake Macleod where large
evaporation
Evaporation is a type of vaporization that occurs on the Interface (chemistry), surface of a liquid as it changes into the gas phase. A high concentration of the evaporating substance in the surrounding gas significantly slows down evapora ...
beds are used for the production of high-quality
salt
In common usage, salt is a mineral composed primarily of sodium chloride (NaCl). When used in food, especially in granulated form, it is more formally called table salt. In the form of a natural crystalline mineral, salt is also known as r ...
and
gypsum
Gypsum is a soft sulfate mineral composed of calcium sulfate Hydrate, dihydrate, with the chemical formula . It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk ...
.
Environment
The lake is recognised as a
DIWA wetland as it is an outstanding example of a major lake situated on the coast that is periodically inundated by freshwater
Birds
Some of the permanent ponds in the north-western part of the lake have been identified by
BirdLife International
BirdLife International is a global partnership of non-governmental organizations that strives to conserve birds and their habitats. BirdLife International's priorities include preventing extinction of bird species, identifying and safeguarding i ...
as an
Important Bird Area
An Important Bird and Biodiversity Area (IBA) is an area identified using an internationally agreed set of criteria as being globally important for the conservation of bird populations.
IBA was developed and sites are identified by BirdLife Int ...
(IBA) because they support
fairy tern
The fairy tern (''Sternula nereis'') is a small tern which is native to the southwestern Pacific. It is listed as " Vulnerable" by the IUCN and the New Zealand subspecies is "Critically Endangered". Fairy terns live in colonies along the coastli ...
s, over 1% of the world populations of
red-necked stint
The red-necked stint (''Calidris ruficollis'') is a small migratory wader. The genus name is from Ancient Greek ''kalidris'' or ''skalidris'', a term used by Aristotle for some grey-coloured waterside birds. The specific ''ruficollis'' is from La ...
s,
curlew sandpiper
The curlew sandpiper (''Calidris ferruginea'') is a small wader that breeds on the tundra of Arctic Siberia.
It is strongly bird migration, migratory, wintering mainly in Africa, but also in south and southeast Asia and in Australia and New Zeal ...
s,
banded stilt
The banded stilt (''Cladorhynchus leucocephalus'') is a Bird migration#Short-distance and altitudinal migration, nomadic wader of the stilt and avocet family, Recurvirostridae, native to Australia. It belongs to the monotypic genus ''Cladorhync ...
s,
red-necked avocets and
red-capped plover
The red-capped plover (''Anarhynchus ruficapillus''), also known as the red-capped dotterel, is a small species of plover.
It breeds in Australia. This species is closely related to (and sometimes considered conspecific with) the Kentish plover, ...
s, as well as a population of
dusky gerygones. The northern ponds consist of intermittently flooded, brackish to hypersaline
mudflat
Mudflats or mud flats, also known as tidal flats or, in Ireland, slob or slobs, are coastal wetlands that form in intertidal areas where sediments have been deposited by tides or rivers. A global analysis published in 2019 suggested that tidal ...
s surrounding saline springs and permanent saline channels and lagoons. Large numbers of
red knot
The red knot or just knot (''Calidris canutus'') is a medium-sized shorebird which breeds in tundra and the Arctic Cordillera in the far north of Canada, Europe, and Russia. It is a large member of the ''Calidris'' sandpipers, second only to the ...
s,
Australian pelican
The Australian pelican (''Pelecanus conspicillatus'') is a large waterbird in the family Pelecanidae, widespread on the inland and coastal waters of Australia and New Guinea, also in Fiji, parts of Indonesia and as a vagrant in New Zealand. It ...
s,
little black cormorant
The little black cormorant (''Phalacrocorax sulcirostris'') is a member of the cormorant family of seabirds. It is common in smaller rivers and lakes throughout most areas of Australia and northern New Zealand, where it is known as the little bla ...
s,
black-tailed godwit
The black-tailed godwit (''Limosa limosa'') is a large, long-legged, long-billed shorebird first described by Carl Linnaeus in 1758. It is a member of the godwit genus, '' Limosa''. There are four subspecies, all with orange head, neck and ches ...
s and
black-winged stilts have been recorded. A substantial population of
canary white-eyes is present. A review of the importance of the lake for shorebirds showed that it hosted significant populations of 10 species of which
red knot
The red knot or just knot (''Calidris canutus'') is a medium-sized shorebird which breeds in tundra and the Arctic Cordillera in the far north of Canada, Europe, and Russia. It is a large member of the ''Calidris'' sandpipers, second only to the ...
, red-necked stint and curlew sandpiper occurred in internationally significant numbers.
See also
*
Leeuwin Current
*
List of lakes of Western Australia
The following lists of lakes of Western Australia are arranged alphabetically:
* List of lakes of Western Australia, A–C (plus numerals)
* List of lakes of Western Australia, D–K
* List of lakes of Western Australia, L–P
*List of lakes of ...
References
{{Authority control
Macleod
MacLeod, McLeod and Macleod ( ) are surnames in the English language. The names are anglicised forms of the Scottish Gaelic ', meaning "son of Leòd", derived from the Old Norse ''Liótr'' ("ugly").
One of the earliest occurrences of the surnam ...
Macleod
MacLeod, McLeod and Macleod ( ) are surnames in the English language. The names are anglicised forms of the Scottish Gaelic ', meaning "son of Leòd", derived from the Old Norse ''Liótr'' ("ugly").
One of the earliest occurrences of the surnam ...
Important Bird Areas of Western Australia